Abstract
Nanoparticles with nominal structures of Au@Ag (core@shell) and Au@Ag@Au (core@shell@shell) were prepared using the sequential citrate reduction technique and characterized using routine characterization techniques, including transmission electron microscopy. X-ray absorption spectroscopy was then carried out on the samples, and extended X-ray absorption fine structure (EXAFS) analysis was used to determine the structure of the systems. The results of the routine techniques and the X-ray absorption spectroscopy were then compared. EXAFS analysis of the nanoparticles with the Au@Ag structure revealed very limited bimetallic interactions, supporting the assignment of a core@shell structure. EXAFS analysis of the nanoparticles with Au@Ag@Au structure showed an increased proportion of bimetallic interactions. Based on the colloid composition, the other characterization techniques and the chemistry of the system, these nanoparticles were interpreted as having an Au@Au/Ag-alloy structure. The EXAFS analyses cor...
Highlights
The catalytic properties of both gold[1−4] and silver[5,6] nanoparticles have been widely studied and reported in the literature, along with the effect of combining gold with other common catalytic metals.[7]
We will discuss the extended X-ray absorption fine structure (EXAFS) fitting models chosen at both edges, with respect to the compositions determined by energy dispersive X-ray spectroscopy (EDS)
The silver character is dominant over the gold character, and with the Au@Ag@Au_Less Au colloid, the Article additional gold has virtually no impact on the localized surface plasmon resonance (LSPR) compared to the Au@Ag system, in agreement with previous reports.[17]
Summary
The catalytic properties of both gold[1−4] and silver[5,6] nanoparticles have been widely studied and reported in the literature, along with the effect of combining gold with other common catalytic metals.[7]. Research has been carried out to investigate the catalytic activity of gold/ silver bimetallic nanoparticles (alloy and core@shell), whose activity has been found to be structure dependent.[8] Typically, capping agents are removed and the particles crashed from the colloid before using the particles as catalysts;[11,12] this is not always the case.[13,14]. Gold−silver bimetallic particles have been observed to self-segregate.[18,19]
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